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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 52 (Automatic Transaxle Diagnosis - 4T65-E) >> Symptom Tests >> Transaxle Range Selector Display Inoperative Or Displays Incorrect Range >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Buick Regal, 2002 Buick Century, 2001 Buick Regal, and 2001 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install a scan tool. Turn ignition on, engine off. Select TR SW. on the scan tool. With the scan tool, observe the TR SW. display while selecting each range: P, R, N, D4, D3, D2 and D1. Does each selected range match the scan tool TR SW. display? If so, see DIAGNOSTIC AIDS  . If not, go to next step.
  2. With the scan tool, observe the TR SW. A/B/C/P display. Does the scan tool TR SW. A/B/C/P parameter indicate HI for all range signal states? If so, go to step  12 . If not, go to next step.
  3. Inspect the transaxle linkage from the range selector to the manual shift shaft, and the transaxle range switch for proper adjustment. Adjust the linkage or the range switch as necessary. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. Did the linkage or the range switch require adjustment? If so, go to step  15 . If not, go to next step.
  4. Turn ignition off. Disconnect the TR switch 4-way connector. Turn ignition on, engine off. Does the scan tool TR SW. A/B/C/P parameter indicate HI for all range signal states? If so, go to next step. If not, go to step  9 .
  5. Using a DVOM and the Connector Test Adapter Kit (J 35616-A), measure the voltage from terminal "A" of the TR switch 4-way connector to ground. Measure the voltage from terminal "B" of the TR switch 4-way connector to ground. Measure the voltage from terminal "C" of the TR switch 4-way connector to ground. Measure the voltage from terminal "D" of the TR switch 4-way connector to ground. Does the voltage measure 10-12 volts at all four terminals? If so, go to next step. If not, go to step  10 .
  6. Connect a fused jumper wire from terminal "D" of the TR switch 4-way connector (signal circuit "A") to ground while monitoring the scan tool TR SW. A/B/C/P parameter. When signal circuit "A" (CKT 771) is grounded, do any other signal circuits indicate LOW? If so, go to step  11 . If not, go to next step.
  7. Connect a fused jumper wire from terminal "B" of the TR switch 4-way connector (signal circuit "B") to ground while monitoring the scan tool TR SW. A/B/C/P parameter. When signal circuit "B" (CKT 772) is grounded, do any other signal circuits indicate LOW? If so, go to step  11 . If not, go to next step.
  8. Connect a fused jumper wire from terminal "C" of the TR switch 4-way connector (signal circuit "C") to ground while monitoring the scan tool TR SW. A/B/C/P parameter. When signal circuit "C" (CKT 773) is grounded, do any other signal circuits indicate LOW? If so, go to step  11 . If not, go to step  13 .
  9. Test the signal circuits (CKTs 771, 772, 773 and 776) of the TR switch that did not indicate HI for a short to ground. Did you find and correct the condition? If so, go to step  15 . If not, go to step  14 .
  10. Test the signal circuits (CKTs 771, 772, 773 and 776) of the TR switch that did not indicate proper voltage for an open. Did you find and correct the condition? If so, go to step  15 . If not, go to step  14 .
  11. Test the affected signal circuits of the TR switch for a shorted together condition. Did you find and correct the condition? If so, go to step  15 . If not, go to step  14 .
  12. Test the ground circuit (CKT 1050) of the TR switch (terminal "D" of the 7-way connector) for an open between the connector and the chassis. Did you find and correct the condition? If so, go to step  15 . If not, go to next step.
  13. Replace the TR switch. See PARK/NEUTRAL POSITION SWITCH  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to step  15 .
  14. Replace the PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to next step.
  15. Turn ignition on, engine off. With the scan tool, observe the TR SW. display while selecting each range: P, R, N, D4, D3, D2 and D1. Does each selected range match the scan tool TR SW. display? If so, system is okay. If not, go to step  2 .
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